نتایج جستجو برای: piercing propeller
تعداد نتایج: 5495 فیلتر نتایج به سال:
Surface-piercing propellers have been widely used in light and high-speed vessels because of their superior performance. One of the major steps in propeller selection algorithm is the determination of thrust as well as torque hydrodynamic coefficients. For the purpose of simplifying design and selection procedure, some relations are presented for determining hydrodynamic coefficients in some st...
surface-piercing propellers (spps) have been widely used in high speed craft due to some desirable features such as high efficiency, omission of resistance of equipment attached to the propeller and proper functioning of cavitation. unlike the submerged propellers, theoretical methods have no significant application on simulation of sppsbecause of problems related to modeling of these propeller...
In this study, two-dimensional flow analysis around cross-section of the surface piercing propeller with a linear profile trailing edge is studied in different Weber numbers. Due to collision of the two-dimensional cross section with surface water, aeration zone is created on the suction side that is heavily impact on the results. The ventilation pattern is a function of the geometrical paramet...
Surface-Piercing Propellers (SPPs) have been widely used in high speed craft due to some desirable features such as high efficiency, omission of resistance of equipment attached to the propeller and proper functioning of cavitation. Unlike the submerged propellers, theoretical methods have no significant application on simulation of SPPsbecause of problems related to modeling of these propeller...
Composite propellers offer high damping characteristics and corrosion resistance when compared with metal propellers. But the design of a hybrid composite propeller with the same strength of metal propeller is the critical task. For this purpose, the present paper focusses on fluid-structure interaction analysis of hybrid composite propeller with Carbon/Epoxy, R-Glass/Epoxy and S2-Glass/Epoxy t...
Propeller is one of the main propulsors for marine vehicles which produces thrust to overcome the resistance of the ship. Propeller works in the place behind the ship where the flow is non-uniform and with three dimensional velocities, so it causes the fluctuating thrust. The first part of this paper employs the boundary element method (BEM) to evaluate and analyze the hydrodynamic performance ...
this paper presents numerical calculations for podded propulsion system using vortex theory and potential panel method. the method discretizes the surface boundary of the body (propeller +pod+strut) and obtained the vortex and propeller surface and potential on strut and pod. a model propeller and strut are considered for these calculations and the results of pressure distribution, flow field a...
BACKGROUND The aim of the study was to focus the awareness of complications of oral piercing among a group of adolescents and young Italian adults with intraoral piercings. MATERIAL AND METHODS A total of 225 teenagers were asked to complete a questionnaire on the awareness of complications of oral piercing. An additional questionnaire was administered in case of oral piercing worn, based on ...
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